433 1019 Warning: Source size may exceed destination size

[JimKueneman]

How can you use string concatenation and not get this warning?

I have this:

Code: Select all

const
  VERSION_STRING = 'V100 03 07 2010';  // 12 characters with spaces not counted
var
  s: string[20];
begin
  s := VERSION_STRING + #13;  // Compiler only deals with 2 operands at a time in this version
  s := s + 'O';
  s := s + #13;
  UART1_Write_Text(s);
  ......

I count 18 characters and have defined a 20 character string. There should be no way I exceed the destination. This warning occurs everywhere I use the "+" operator.

Jim

[Bryn]

Code space is too valuable to include run-time array bounds checking so the compiler is just giving you a friendly little warning to be extra careful when using string manipulation which may affect a string's length.
I read it as "please; double-check that your string lengths are Ok"

[JimKueneman]

But usually there is a way to suppress warnings to tell a compiler "Yes I know what I am doing".


Jim

[OT]

But usually there is a way to suppress warnings to tell a compiler "Yes I know what I am doing".

Jim

Yes, untick the "warning" and "hints" and the messages will be all gone, only errors show up.